Which countries are confirmed to use the model year? I first thought this was a North American-only thing, as per Wikipedia. But it seems that it is applied to various other countries on IMCDb and even local car dealers labeling cars as a certain MY if the respective vehicle was produced after a certain month (probably done for re(sale) value of the vehicle). What's official here and what isn't? It's becoming confusing.

Confirmed countries are: USA and CDN (according to Wikipedia, at least) and possibly Russia but I've seen model years applied to Japan cars?
Japan doesn't use this and it is unheard of, yet I still see the year used on Japanese vehicles produced in the latter half of the year.
Could we make an organized list of countries that use this system for future reference? Which countries are actually known for using it officially? That Wikipedia article seems North American focused and incomplete.